Colorado Ignition Interlock — Requirements & Costs

An ignition interlock device (IID) is a breathalyzer wired into your vehicle's ignition system. It prevents the engine from starting if it detects alcohol on your breath above a preset threshold §42-2-132.5. In Colorado, IID requirements are a central part of DUI consequences.

available/required for early reinstatement after admin revocation; mandatory for Persistent Drunk Drivers (BAC ≥ 0.15 or refusal) and all repeat offenders.

first offense (standard BAC): early reinstatement with IID available at any time, with the restriction lasting the time remaining on the 9-month revocation and removal possible after 4 consecutive clean monthly interlock reports; 2 years for Persistent Drunk Drivers or refusals; 2-5 years for multiple convictions.

Common violations that can extend the IID period or trigger additional consequences:

• Failed startup tests (BAC above threshold)
• Failed rolling retests
• Missed calibration appointments
• Tampering with or attempting to circumvent the device
• Operating a vehicle without an IID when one is required

IID costs are borne by the offender and include:

• Installation fee
• Monthly monitoring/rental fee
• Removal fee
• Calibration fees (may be included in monthly rental or charged separately)

While the IID is a restriction, it is also the mechanism that allows many offenders to resume driving sooner than they would under a full suspension. In Colorado, After 1 month of revocation, the driver may obtain early reinstatement with an ignition interlock restricted license for the remaining 8 months. Complying fully with IID requirements — no violations, on-time calibration — is the fastest path to full reinstatement.